Crank-shaft gear for looms



Feb. 1 1927.

w. H'. BAHAN CRANK SHAFT GEAR FOR Looms` Filed Nov.-25, 1925 PatentedFeb. 1, 1927.

' unirsel stares- WILLIAM H.: BAHAN, kF GREENVILLE, SOUTH CAROLINA.

inane v, CRANKVSHAFT GEAR FOR LOOMS.

Application led 1\Toven1ber25,,1925. Serial No. 71,494.

This invention 'relates to gears and more particularly to an improvementin crank shaft gears for looms.

It is a Vwell known fact that the crank shaft gear. of a loom issubjected to very considerable wear for a portion of its periphery andthat the teeth of the gear which are located at this portion thereofsoon become worn or broken', thereby necessitating the removal of thegear and the substitution of a new one. Ordinarily, this `has requiredthe taking down of the crank shaft and this, of course,involves'considerable time and labor. Furthermore, such gears, wheremade in one' i5 piece, are discarded, although only a portion of theperiphery of the gear is worn to any considerable extent. Therefore, thepresent invention has as its general object to provide a crank shaftgear fory looms which may' be removed without the necessity of takingdown the crank shaft, and which gear em# bodies a major section andaminor section, the latter section including a segment which, when inplace, completes the toothed periphery of the gear as a whole and whichsegment constitutes the part `of the gear the teeth of which aresubjected to theA greatestv wear, so that when the part becomes worn italone requires to be replaced and it, therefore, is not necessary todiscard ythe entire gear. a

Another object of the invention is to s o construct the gear that a newsegment may be substituted for a worn one without-the necessity ofremoving the major section of the gear or disturbing the crank shaft. y

Another object of the linvention is to so construct the two sections `ofthe gear that there will .be no likelihood of disarrangement of thesegment section or any looseness or play thereof, means being providedfor securing the sectionstogether in such a manner that the segmentsection is substantially' las securely united to the major section` asthough it were an integral partthereof. In the accompanying drawings z`Figure 1 is a group perspective view illust'rating the two sections ofthe gear lembodyd ing the invention relatively separated.

f' The segment section Figure 2 is a side-elevation of thegear with thetwo sections thereof assembled. yFigure 3 is a vertical sectional viewthrough the gear, taken substantially -on the j line S-Sof Figure 2.

As before stated` the gear embodying the invention comprises a major'section and a minor or segment section, which sectionsare indicated ingeneralrespectively by the nuy merals 1 and 2. The major section 1 ofthegear comprises a rim 3 and a web 4 which is peripherally surroundedbythe rim, the said a web 4 having a central approximately circu-l laropening 5 formed therein and at one side of this opening being cut awayto provide a radially extending recess 6,the opposite side wallsofwhich, indicated by thenumeral'7, are extended along diverging linesin `the direction of the yperiphery `of the section.`- f

The rim Bis provided with the usual gearl teeth 8 which, of course,extend in a series circumferentially of the rim from end to end thereof.The web 4 is preferablylocated in a plane spaced inwardlyV a slightdistance from one side of the rim so as to provide a recess 9 in oneface ofthe gear section, and the wall 10 of this recess is preferablyslightly beveled as shown inthe draw-l ings.` The web is formed with aplur'alit'yof openings 1.1, ordinarily three in number, v spacedk apartat approximately 90, so that and p two of the openings are located atopposite a sides of the opening 5 and the third opening is locatedopposite the opening 5 and dia'- metrically opposite the recess 6.

2 of the gear comprises a flatsided approximately circular body 12,y theperiphery -of Which is slightly beveled,v and this body is of a'diameter to fit snugly within the recess 9, the periphery 'of the vbodysnugly fitting the beveled wall :l0 of the said recess 9, when thesections are assembled.y The body 12 is formed upon one face with a boss13 of a thickness equal substantially to the thickness of the web 4 of'the gear section l and of approximately s egmental form so that itsopposite diverging edges willhave Wedging engagement in the recesslwhenthe'gear sections are assemtion 1 opposite the face 'in which the recess9 is provided, but likewise, the body 12 of the segment section 2 is ofa thickness equal plate.

substantially to thev depth of the recess 9s0 that its face will beflusliwithf the corre-v sponding side of the rim 3, when the parts areassembled. The body 12 is formed with openings 14 which are designed toregister with. the openings 11 when the two sections vof the. gear areassembled, and said body and the. boss 13 are formed with. an opening15- .which is located substantially at 90,0 from the two first,mentioned openings 11 ofthe gear section 1. The body 12 ofthe gearsection 2 is formed with a radial recess 16 which vvmay have 'parallelwalls and ywhich extendsv from -an approximately circular open-ing17formed axially in the said .body 12, through the periphery of the saidkbody and between two of the openingsv 14. The boss 13 is formed with varim portion 18 which, `when they sections are assembled, matches andconstitutes a continuation` of the rim 3 of the gear section 1, andthis. rim portion is provided with gearjteeth 19, which teeth, togetherwith the teeth `8 ofthe gear section 1, complete the continuous seriesof gear teeth.

In applying the gear, the gear section 2 is -fitted over the crank shaftof the loom and disposed against the side ofthe tight orfastenedfpulleyor the friction plateupon the. saidsliaft, and the.section 1 is then fitted over the crank` shaft and assembled with thesection 2. Bolts are then secured tbroughthe registering openings of thetwo sections andthrough thelopening 15, to secure the gear to the saidpulley` or 'friction Itwill be observed by reference to Figure 2, thatvwhen the sections are assembled, the recess 16 is'closed or'spanned bythe web of the section 1 so that a truly circular opening is providedaxially of the ygear as a whole, the boss 13, at its inner end, being ofarcuate forni, as indicated `by the numeral 20, lto conform to the wallof the` opening17 f i It will be understood that.y the segmentv 18 ofthe gear section 2 is the portion ofthe gea-r which receives thegreatest wear and it will, therefore, be evident that when the teeth ofthis segment become worn or broken, i

the section 2 may be readily separated from the sect-ion 1 and from thecrankshaftwithf out disturbing the latter and a new section 2substituted therefor. It will be evident from an inspection of theVdrawingsr and 'the foregoing description that yall four of the ,securingbolts which are ordinarily employed in securing a one-piece geary to`the tight pulley or friction plate upon the crank shaft of a loom, aresecured through the segi'i'ient section 2 of the gear of the presentinvention and that three of said bolts are secured also through themajor section 1 of the gear, so that the gear as a wholens assubstantial and rigid as the ordinary 1ntegial one-piece gear.Furthermore, due to i the Wedgingengageinent.of the boss 13 in the web,the walls ofthe recess being diverged outwardly, and altoothed rimextending about the. periphery ofthe web and terininatingat therecess'at. the.V opposite sides thereof, the web being spaced inwardlyfrom' one side of the.VK rim tofprovide a recess at the correspondingface of the said section, the wall of ther recess being inclined, thesaid `web .being provided with openings for' the passage of securingVelements and said openings being arranged about the saidA shaftreceiving opening therein and a s'eg ment section'comprlsing asubstantially lcircular body having a beveled. p.eriphery,the

said body beingtted within-.the recess with its, said. periphery snuglyfitting vthe wall of the recess inthe face ofthe first. mentionedsection, thesaid body having a shaft-receiving opening andv a recessextending therefrom and through the. periphery of the body,` said bodyhavingV openings therein `registeifing with the. openings. in the web of.the first. mentioned section for. the passage of securing elements,.the body having aboss uponits face extending'v between theshaft-receiving opening and the periphery vof the-body, the. boss atits.inner end'being of'arcuate form to constitute a part of .the wall ofsaid shaftfreceiving opening, the said boss being of increasing widthfrom its inner to, its outer portion and fitting snuglyfbetween. .thewalls of the-*recess in the. iirst mentioned.. section, the. bossbeingprovided at its outer portion. with a Vtoothed run portion. extendingbetween the ends of the rim ofthe first mentioned section Vand beingprovided. with` an opening for the passage of a securingelement.

2. A gear of the class described comprising a sectionpliaving a web andan overhanging rim .to provide a recess, said web havingy a centralAshaft receiving opening and aradially disposed recess extendingtherefrom to the rim, and ya companonsecton comprising a substantiallycircular body having a shaft receiving opening and.v a radially disposedrecess extending therefrom to its rim, said body having a bosscorresponding in shape to the recess of the first named section, saidboss being adapted to fit into the recess of the first named sectionwhen the body is engaged in the first named recess of the first namedsection with itsl periphery engagedv yWith, the inner wall l Intestimony whereof I affix my signature.

WILLIAM H. BA1-IAN. [Ls]

